Actually, there are other ways.
If the drum set is loud, it can be adjusted from the drum set itself.
The method is: put thick cotton on each drum surface, but the simpler method is to put sanitary cotton directly on it. The more pads, the less noise. Then stick a thick tape on it, and it's OK.
Try to talk to the teacher in this drum classroom.
If it still doesn't work, please ask the landlord to install sound insulation boards in this classroom.
But if this is a stubborn person, then you should report to the relevant departments, because you have made efforts, and there will be a good reason then!